Biology, 27.02.2020 04:18 ReaFam

what is the best explanation of how scientists know cyanobacteria existed 3.5 billion years ago

A; They were found in fossils that scientists were able to date

B; They have learned alot

C; None Of These

D; They saw it growing today and were able to date it back

Answers: 2

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what is the best explanation of how scientists know cyanobacteria existed 3.5 billion years ago